Hello,

I believe you will find that the browser input is the most stressful of them all on taxing your system requirements.

try using another input to see if you still have the issue like a logitech c920 webcame or similar as a test. (no borowser)

It also seems you are probably using x264 CPU encoding. this is going to be tough using anything other than fastest on a low GHZ speed processor lower than 3GHZ quad core.

If you have an internal graphics card use it to encode using hardware encoding.

if you have an internal graphics card and on board Intel graphics enable Optimus compatibility for a boost in performance.